Drive and driven device



Dec. 4, 1928. 1,694,008

G. H. FRASER muvs AND DRIVEN DEVICE Filed se t. 12, 19 24 s Sheets-Sheet1 INVENTOR 6 M4 M Dec. 4, 1928.

G. H'. FRASER DRIVE AND DRIVEN DEVICE 5 sheets she'et 2 Filed Sept. 12,1924 INVENTOR Dec. 4; 1928.

G. H. FRASER DRIVE AND DRIVEN DEVICE :5 Sheets- Sheet 5 Filed Sept. 12,1924 INVENTOR Patented Dec. 4, 1928.

GEORGE HOLT FRASER OF BROOKLYN, NEW YORK.

DRIVE AiND nnlvniv DEVICE.

Application filed September 12, 1924. Serial No. 737,412.

This invention relates to driving mech anism and to driven devices, andaims to pro\'*ide certain improvements therein.

lt relates especially to drives for unbalanced or variable load devices,to frictional transmission, to variable speed mechanism, and toapparatus in which any of these are applicable, and in itspreferred formprovides an improved frictional, variable, automatic driving means, andimproved apparatus in which such means are utilized.

The invention aims to increase efficiency, and availability of saidmeans and devices, to save power consumption in operating them, and toimprove their constructions and operation. i

To this end in carrying'out the preferred daptat-ion of my presentimprovements I provide reciprocal reversely revolving parts oo-actingwith an intermediate revolving part to mutually resist and balance theaxial stress of the reversely revolving parts by ting this to tneintermediate part at its diametrically opposite sides;

And 1 preferably provide traction or friction. for driving engagementsbetween these parts, and l1lftl0.ll1 intermediate part the driving partand adjustable radially to the other parts to vary their s eed;

And 1 preferably provide for automatically adjusting tlie'intermi-idiate part to vary the speed of the other parts withvariations in the load on them; I I And'I provide various other featuresof improvementin construction, arrangement and use of aid improvementswhich will hereini r be more fully set forth; I M pp ent in'iprovementsare applicable to a wide range of mechanical and other 'de vices, andcan be applied to many transmission use" wiil do 'ibe them in theirpreferred form as applied tothe preferred form of my improved ball. ortube mills, with ref :ence to the accompanying drawings in wnu:h

ll 1 is a piagmentary and diagraunv in; 5 plan vie-v." of a four cylnder ball and tube mill unit embodying the preferred form of myimprovements and operating according to my mproved method, the upperylinders bei broken out to show the lower cylinders, aiid some of theparts being in SS Q-lOU for clearness;

ion thereof cut approximately on the line 2 in Fig and looking 1n thedirect ouot ments but for purposes of illustration 1' ig. 2 is afragmentary vertical transverse the arrow, some'of the parts beingbroken out for clearness; i

Fig. 3 is a fragmentary side elevation thereof, partly in section on theline 8 -3 of Fig. 1 and looking in the direction of the arrow,

some of the parts beingbroken out for clearness tion of a two cylindertube mill showing a modified utilization of my improvements;

5 is a fragmentary vertical cross section of a one cylinder tube millshowing another modified utilization of my improve-v Fig. 6 is anenlarged fragmentary plan View partly in horizontal axial section ofpart of the driving mechanism shown in Fig. 1, and v i Fig. 7 isa'diagram showing the ball mills revolved faster than and feedingthepebble Fig. 4 is a fragmentary vertical cross secs mills at a measured.rate to preserve their balance.

Referring especially to Figs. 1 and 2 I will now describe the preferredform of my invention as applied to ball and tube mills.

Referring to the drawings, let Arepresent the frame or support of a fourcylinder pulverizing installation, 13 C, D and E the cylindersor drumsthereof, F the driving mechanism for revolving the cylinders, and G thesource o f power for operating their driving mechanism. '7 I These partsmay be of any usual or suitable construction or arrangement for utilizing the tumbling of their contents during their revolution forpulverizing material according to the usual ball or tube milljmethod.Such drums are usually charged with balls, slugs or pebbles andcontinuously fed with material to be'pulverised so as to make the chargein each of them about half fill their internal chamber. lVhen idle thischarge settles and substantially balances itself at the bottom of thechamber, but'as the cylinder is revolved it, rises with the ascendingside until I the upper part cascades across the chamber tothe lowerside, speed being adjusted to maintain the unbalanced condition whichwill give the most effective cascading of the contents. V

V The foot pound loss incident to the tum: bling of the contents fromthe top to the bot.- tom of the chamber is unavoidable, and powerconsumption for this as well as for-revolving the drum and its chargeareessential todol g the W rk in; hi man er, but additio sate for the footpounds loss incident to tumbling, and to this end I provide forseparating the stress of the unbalanced load from that to the effectiveload, and means for sustaining this unbalanced stress additionally to orindependent of the source of power for revolving the drum. I

This may be accomplished in many ways, but I prefer to use a Worm gearfor the drum, a worm meshing with this gear for revolving the drum,antifrietional means axially sustaining the worm to resist the drivingand un balanced stress of the drum, and means for revolving the wormfrom a source of power independent of its axial stress. v

As shown in Fig. 1 the drum B is provided with a left hand worm gear Imeshing with the left hand worm J, which revolves in the direction ofthe arrow to cause the drum to revolve so that its charge rises on itsleft hand side making an unbalanced load tending to force the worm Jtoward the right, and move ment of the worm in this direction isresisted by a roller K co-acting with a wheel L on the worm shaft, whichroller K is sustained by a wheel M on the worm shaft of a left'hand wormN meshing with a left hand worm gear O on the drum C to revolve thisdrum reversely to the drum B so that its charge: will rise on its righthand side and its unbalanced load will tend to force the worm N towardthe left, so that this stress will be transmitted through its wheel Magainst the roller K at diametrically opposite thewheel L, so that theaxial stress on each worm will be balanced by that of the other throughthe medium of the roller K which revolves between their wheels andsustains their driving and dead loads, which should best beapproximately. equalized by properly charging the respective drums tothis end. 7

. The roller K may be a mere anti-friction roller and the worms may besuitably reverse: ly driven, but I prefer to utilize the roll K as adriving roller and to apply the source of power to it, and to have ittractionally drlve both worms, so that it sustains their axial stressand utilizes this for frictional or tractional engagement between itsedge driving face and the side driving faces of the wheels L and M. a

Preferably the drums B and D are ball mills revolving at different speedthan and feeding the drums C andE which are pebble mills. and theirworms and gears are differentiated to suit their relative speeds. A;conveyor or gravity connects the ball mill discharge with the pebblemill intake, and any usual measured feed and discharge preserves theirrelative charges to imiintaindesired unbalant-ed conditions as shown inFig. 7

The roller K is sustained by a movable or sliding bearing 07 so it canmove axially of the worm shafts to compensate for any axial movementthereof due to slight variations in the charges of the respective drums,such movement being limited by the thrust roller bearings P for eachworm shaft. The shaft Q of the roller K is connected by a compensatingor other movable joint R with the shaft S of a motor orother primarysource of power T.

In starting a tumbler mill more power is required to lift the charge andovercome its inertia than is required to maintainrevolution after thecharge has assumed its running position, and my invention preferablyprovides for automatically varying the drive to suit variations in load,which 1 preferably do by moving the roller K radially of the wheels. Theroller is adjusted axially to give 7 the desired speed of normaloperation, varied from its normal position to vary speed of the drums,and automatically moved from and toward this position according to load.

Any suitable means for automatically operating the roller may be usedbut I prefer my improved device comprising a forked lever U operated bya movable ring or cam V which revolves with and is carried by a hub Wfixed to the worm shaft outside of the traction wheel and driven fromthe latter by aspring X so that when the stress transmit-ted from thetraction wheel through the hub W to the worm shaft exceeds theresistance of the spring the traction wheel can rotaterelatively to thehub on the worm shaft to the extent that the spring yields, and thisrelative rotation will tilt a lever Y fulerumed to the wheel and havingone end in engagement with the in such manner that when the wheel andhub are in normal working position the ring will be in normal positionon the hub, but should the stress cause the spring X to yield the ringwill be moved axially and tilt the lever U to move the roller Koutwardly and lower the speed of the worm shaft and correspondinglyincrease the leverage of the roller by moving it into engagement with a'portion of the wheel of larger diameter. As load diminishes the spring Xwill restore the wheel and .hub and its other end connected to the ringV V My invention preferably supplements the tractional drive of theroller K by individual belt drives while speed is normal, and preferablydisconnects these during variations of speed. v

This is preferably accomplished by inounting a pulley a on each wormshaft so that it revolves therewith but is slidable axially thereof sothat the axial stress of the worm shaft is independent of the pulley andis sustained by its thrust bearing or thrust rollers while its rotatingstress only is carried by the pulley. As shown a pulley a is providedfor each worm shaft and driven by'a belt 7) from a pulley 0, each ofwhich is mounted on a countershaft d and driven by a bevel gear 6 from.a bevel gear f which is feathered to the shaft S so that it canslideaxially thereof Cit and is connected to the shaft Q, to be movedtherewith in such manner that when the roller K is in its outwardposition the gear will be moved out of mesh with the gears 0.

These gears and pulley should be proportioned to correspond in speed ofdrive with the speed at which the roller K operates the worm shafts inits mean position, so that then they will supplement it, but when speedis reduced by moving this roller outward they will be disconnected andthe roller alone will be relied on for startingand stopping. a

To vary the supply of power to' the primary driver I preferably providea lever h operated by the movement of the automatic load vary ing deviceto regulate the motor according'to the load on it in any suitablemanner, as by operating a resistance 2' controlling its current orspeed. i I

To insure uniform charging of the multiple drum installation after equalcharging has been effected each is provided with regulating tendingmeans as for example the spiral feeders g which are adjusted to equalfeeding each half of the unit.

Preferably I supplement the worms J and N by a left hand worm engaging asupple"- mentary left hand worm gear on the drum B and a right hand wormZ engaging a supplementary right hand wormgear m on the drum C, whichworms are adjustably connected together by a tension shaft 11 so thatthey revolve-together at the proper speed to coincide with the speed ofthe drums and are adjusted to transmit from one to the other a portionof the unbalanced stress or load to resist this. The shaft n is revolvedat suitable speed in any suitable manner, but preferably from the shaftto the worm N, as by a belt 0 and pulleys p and g suitably proportionedto give the desired speeds requisite to the revolution of the drums andarranged so that part of their unbalanced loads shall be carried by thetension shaft 11 and transmitted by it from one to the other drum.

Preferably I supplement the worms J and 'T N y a lefthand worm 7' belowand engaging a supplementary left handiworm gear 8 on the drum D, andbya right hand worm t below and'engaging a supplementary right hand wormgear n on the lower drum E, wh1ch worms are'adpistably mounted on acompression shaft 4) so that they revolve together at the proper speedto coincide with the speed of these drums and are adjusted to transmitfrom one to the other a portion of the unbalanced stress or load toresist this. The shaft 0) is preferably driven from the shaft of theworm N by the pulley belt 10 and pulley a".

The shafts a and o preferably float axially so that they can adaptthemselves to equalize between them the varying stress resistedby theirrespective worms and'to transmit these from one to another drum, and Ipreferto posit-ioni them axially by fixing afthrust disc; 1 on each endof each, andproviding a reciprocal disc 2 opposite these discs andsustained by an anti-friction bearing a preferably carried on the end oftheshafts of the worms J and N, and by providing anti-friction rollersZ1 between the discs 1 and z to transmit the axial stress of the shaftsn and 1 12 to the disc z and through it to the shafts of the worms JandN. The discs g and 2 have side friction faces and the rollers b haveedge traction faces in the construct-ion shown, so as to in-- sure equaltractional drive and speed for the supplementary worms, and arepreferably supplied at each end of their shafts.

In operation with the construction shown the roller K will revolve thewheels L and M in opposite directions, and their left hand worms J and Nwill revolve the drum in 0p-1 posite directions as indicated by thearrows in each. This will ,throw' the charge in each drum in positionoppositeto' that of the other drum so that its unbalanced load will actin.

the direction indicated by the arrow without the drum! This will tend,to'move the'worm J toward the roller K fromthe left and the worm Ntoward the roller K from the right,

and will be resisted by this roller andtrans- I mitted from one to theother of the wheel's L and M and serve toinc're'ase'the tractionbetweenthe edge of the roller and'the side faces of the wheels to insure asuitable tractional -M to move relatively to their hubs W, which willcause the regulator U to move the roller K outwardly and thus increaseits leverage by moving it to the larger outerdiameter of the wheels soas to lower their speed until the excessive load is overcome. In theconst-ructionshown this outward movement of theroller willalso disengagethe bevel gear f and permit the pulleys c to run freely while the speedof the wheels is below normal, and it will also vary the primary moverto increase its power or diminish its speed during this overload. As theoverload diminishes the springs X will restore the wheels relatively totheir hubs, causing the regulator to restore the roller to its normalposition, which will engage the bevclgear f with its pinions e andrestore the primary mover to normal po-. sition which will be maintainedduring normal operation. a

It will be seen that my invention provides improvements which can bevariously and advantageously availed of, and it will be un-- derstoodthat it is not limited to the particu lar arrangement, combination, ordetails, ,set

forth as constituting thelpreferred embodi mcnt thereof, as it may beavailed of in whole or in part according to such modifications ascircumstances or the judgment of those skilled in the art may dict-atewithout depart ing from the sprit of the invention.

\Vhen used with two drums and a single shaft the worm should be rightand left and the shaft should be a tangential compression membersuitably positioned axially and driven rotatively by means independentof its axial stress.

Onesuch modification is shown infFig. 4 in which the opposite drums l3and C are driven by a compression shaft 0' on which is fixed a righthand worm J meshing wit-ha right hand worm gear I on the drum B" torevolve it in the direction of the arrowiand a left hand worm N meshingwith a left hand gear 0' on the drum C to drive it in thereversedirection, theunbaianced load of each drum being transmitted to theother through the shaft 0', which is axially movable under this stressand has fixed to it a driving gear K which participates in its limitedaxial movement and meshes with a wide faced pinion 0 along which it canfloat axially but by which it is revolved to drive the Worms.

Feathered on the shaft 0' is a pulley g" which is revolved by it butindependentof its axial movement and which through a belt 0 and pulley pon a tension shaft n revolves the latter, which carries a left hand wormj" meshingwith a left hand worm gear is on the drum B, and also a. righthand worm Z meshing with a right hand gear inon the drum C these wormsand this shaft serving as supplementary means for resisting andtransmitting unbalanced overload from one to the other drum, and beingproportioned adjusted and revolved suitably "for such purpose. Y

A single drum utilization is shown in Fig. 5, in which the drum B isrevolved by a left hand worm N carried by a compressionshaft a sustainedby an anti-friction thrust bean ing P which shaft is revolvedindependently of its stress by drive pulley K splined on 1t.

\Vith this construition the ubalanced stress may be apportioned betweenmultiple worms by using a right hand worm Z and a supplementary right hand worm gear .711. above the drum B in which case'I prefer to fix onthe shaft 0 a thrust disc ;1 and on the slia'l'tn a similar disc, and tomount between their opposed side traction faces an edge trac tion roller7F which receives and resists theopposed axial stress of the worms andtractio'nally drives one from the other in reverse direction andatproper relative speed to correspond with the speed of rotation of thedrum and to apportion its unbalanced load. between them. 7

My invention includes using two drums successively, the first as a ballmill for preliminary grinding and the second as a tube mill forreceiving and finishing the discharge 1. In combination, a driven partrevolv-r ing about an axis and having a side traction face, a shaftsustaining an axial stress and axially sustained by and revolved by saidpart, a driving part revolving about an axis angular to said axisandhaving an edge traction face in tractional engagement with said sideface for driving it, and means controlled by said first memberforvarying the position of said second member radially of said firstmember. 1

2. In combination, driven parts oppositely revolving about the sameaxisand each having a side traction face opposite and spaced from that tothe other, an axially slidable driving part movable'radially of saidfirst partsand revolving about an axis angular to said axis and havinganedge traction face tractionally engaging said side faces to reverselyrevolve said first parts, and means controlled by one of said side-faceparts and operated by the driving stress transmitted by one of saidsideface driven parts for varying the position of said second part radiallyofsaid'lirst parts. p

In combination, op iiositely revolving similar worms, oppositelyrevolving worm gears driven by said worms respectively, compressionmeans transmitting the axial stress of said worms from each toward andto the other, and means for revolving said worms.

4. In combination, two worms, worm gears inde endent of each other andrespectively lGiOFYltl in opposite directions by said worms, meansconnecting saidwormsto transmit. the axial stress of one to the other,

which they are axially mbvable.

5. In combination, two worms, oppositely revolving worm gearsindependent of each other and respectively revolved by said worms,compression means between said worms for resisting their axial stress,and means for revolving said worms as to which they are axially movable.

6. In combination, two worms, oppositely revolving worm gearsindependent of each other and respectively revolved by said worms,revolving stress transferring means connecting axial stress, and meansfor revolving said norms as to which they are axially movable.

7. In combination, right hand and left hand worms, right hand and lefthand worm gears independent of each other and respectively oppositelyrevolved by said worn s respectively, means sustaining the axial stressof said worn'is, and means as to which said worms are axially movablefor revolving said worms. i

8. In combination, oppositely revolving worms, oppositely revolving wormgears, independent of each otherand respectively reand means forrevolvin said worms as to volved by said worms, means sustaining the ofsaid worms, and means for axial stress simultaneously revolving saidworms.

In combination, oppositely revolving worms, worm gears independent ofeach other and respectively oppositely revolved by said wormsrespectively, means between said worms sustaining their axial stress,and means for revolving said worms. 1

10. In combination, oppositely revolving worms, gears independent ofeach other and respectively revolved by said worms, revolving meansbetween said wo ms for transmitting axial stress from one to anotherthere-. of, and means for revolving said worms.

11. In combination, oppositely revolving worms, oppositely revolvingworm gears revolved by said worms respectively compression meanstransmitting the axial stress of said worms from each toward the other,and revolving means for driving said worms between them and sustainingtheir axial stress.

12. In combination, oppositely revolving worms, oppositely revolvingworm gears revolved by said worms respectively, wheels sustaining theaxial stress of said worms and each having a side traction face oppositeand spaced from that to the other, a roller havingan edge traction facebetween and en sa'd worms for resisting their 13. In combination, a.revolving drum adapted to revolve with an unbalanced load, a worm gearfor revolving said drum, a worm for revolving said gear, a wheel forsustaining the axial stress of said worm and having a side tractionface, an oppositely revolving wheel for sustaining the axial stress ofsaid worm and having a side traction face opposite and spaced from saidfirst face, a roller having an edge traction face between andtractionally engaging said side faces and transmitting the axial stressof said worms between them, and means for revolving said parts.

i l. In combination, a drum adapted to revelve with an unbalanced load,worm gears for "evolving said drum, separate revolving and relativelymovable worms meshing with said gears respectively, means for revolvingsaid worms, revolving means connected to said worms respectively forsustaining the axial stress of each, and revolving means interi'nediateof said sustaining means for transmitting the stress of one thereof tothe other thereof.

15. In combination, oppositely revolving members each adapted to revolvewith an unbalanced loadreverse to that of the other, worm gears forrevolving said membersrespectively, worms for revolving said gearsrespectively, means sustaining the axial stress of said worms from eachother, revolving means between said sustaining means fortransmittingsuch stress from one to the other thereof,'-and means forrevolving said parts.

16. In combination, oppositely revolving drums each adapted to revolve acascading load reversely L9 the other, worm gears for revolving saiddrums respectively, worms for revolving said gears respectively,compression. means between said worms for resisting their axial stress,revolving means between said resisting means sustaining each thereoffrom the other thereof, and means for revolving said worms.

17. In combination, a revolving driven member having a side tractionface, an axially movable revolvin driving member hav ing an edgetraction face coacting with said side face to tractienally drive thelatter, yielding means carried by one of said parts for drivinglyconnecting it to its said face, and shifting means operated by saidyielding means to vary the axial position of said edge driving face tovary the speed of said driven part. Y

In witness whereof, I have hereunto signed my name.

